基于GMA柔性换向放大机构的结构设计与优化

Structural Design and Optimization of Flexible Commutation Amplification Mechanism based on Giant Magnetostrictive Actuator

设计了一种以超磁致伸缩驱动器(GMA)为驱动单元,以杠杆式柔性铰链进行位移换向放大的微位移传递机构。根据弹性力学理论,在考虑柔性铰链转动中心偏移量的基础上,推导出柔性换向放大机构的放大比和固有频率表达式,运用Matlab软件优化分析柔性铰链的切割半径R和最小厚度t等几何参数,获得了柔性铰链几何参数的最优值,并对优化后的结果进行有限元分析,最后,将仿真结果与理论分析结果进行了对比。研究结果表明,理论分析与有限元分析验证了理论模型的正确性,实现了机构放大倍数高、位移换向呈直线输出的设计目标。

A micro-displacement transmission mechanism with giant magnetostrictive actuator(GMA)as the driving unit is designed,which uses lever-type flexure hinge for displacement commutation and amplifica tion.Based on the theory of elasticity,the amplification ratio and natural frequency formulas of the flexible com mutation amplification mechanism are derived by considering the deviation of the rotation center of the flexure hinge.The geometric parameters of the flexure hinge,such as radius R and minimum thickness t,are optimized and analyzed by using the software of Matlab,by which the optimized geometric parameters of the flexible hinge are obtained and the optimized results are analyzed by finite element analysis.Finally,the simulation results are compared with the theoretical analysis results.The results show that,the correctness of the theoretical model is verified by theoretical analysis and finite element analysis,and the design objective in high amplification ratio,displacement commutation and linear output is achieved.